.\" Copyright (c) 2001 - 2006 Kungliga Tekniska Högskolan
.\" (Royal Institute of Technology, Stockholm, Sweden).
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\"
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\"
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\"
.\" 3. Neither the name of the Institute nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $Id$
.\"
.Dd November 22, 2002
.Dt RSHD 8
.Os HEIMDAL
.Sh NAME
.Nm rshd
.Nd remote shell server
.Sh SYNOPSIS
.Nm
.Op Fl aiklnvxPL
.Op Fl p Ar port
.Sh DESCRIPTION
.Nm
is the server for
the
.Xr rsh 1
program. It provides an authenticated remote command execution
service.  Supported options are:
.Bl -tag -width Ds
.It Xo
.Fl n ,
.Fl Fl no-keepalive
.Xc
Disables keep-alive messages.
Keep-alives are packets sent at certain intervals to make sure that the
client is still there, even when it doesn't send any data.
.It Xo
.Fl k ,
.Fl Fl kerberos
.Xc
Assume that clients connecting to this server will use some form of
Kerberos authentication. See the
.Sx EXAMPLES
section for a sample
.Xr inetd.conf 5
configuration.
.It Xo
.Fl x ,
.Fl Fl encrypt
.Xc
For Kerberos 4 this means that the connections are encrypted. Kerberos
5 can negotiate encryption even without this option, but if it's
present
.Nm
will deny unencrypted connections. This option implies
.Fl k .
.\".It Xo
.\".Fl l ,
.\".Fl Fl no-rhosts
.\".Xc
.\"When using old port-based authentication, the user's
.\".Pa .rhosts
.\"files are normally checked. This option disables this.
.It Xo
.Fl v ,
.Fl Fl vacuous
.Xc
If the connecting client does not use any Kerberised authentication,
print a message that complains about this fact, and exit. This is
helpful if you want to move away from old port-based authentication.
.It Xo
.Fl P
.Xc
When using the AFS filesystem, users' authentication tokens are put in
something called a PAG (Process Authentication Group). Multiple
processes can share a PAG, but normally each login session has its own
PAG. This option disables the
.Fn setpag
call, so all tokens will be put in the default (uid-based) PAG, making
it possible to share tokens between sessions. This is only useful in
peculiar environments, such as some batch systems.
.It Xo
.Fl i ,
.Fl Fl no-inetd
.Xc
The
.Fl i
option will cause
.Nm
to create a socket, instead of assuming that its stdin came from
.Xr inetd 8 .
This is mostly useful for debugging.
.It Xo
.Fl p Ar port ,
.Fl Fl port= Ns Ar port
.Xc
Port to use with
.Fl i .
.It Xo
.Fl a
.Xc
This flag is for backwards compatibility only.
.It Xo
.Fl L
.Xc
This flag enables logging of connections to
.Xr syslogd 8 .
This option is always on in this implementation.
.El
.\".Sh ENVIRONMENT
.Sh FILES
.Bl -tag -width /etc/hosts.equiv -compact
.It Pa /etc/hosts.equiv
.It Pa ~/.rhosts
.El
.Sh EXAMPLES
The following can be used to enable Kerberised rsh in
.Xr inetd.cond 5 ,
while disabling non-Kerberised connections:
.Bd -literal
shell   stream  tcp  nowait  root  /usr/libexec/rshd  rshd -v
kshell  stream  tcp  nowait  root  /usr/libexec/rshd  rshd -k
ekshell stream  tcp  nowait  root  /usr/libexec/rshd  rshd -kx
.Ed
.\".Sh DIAGNOSTICS
.Sh SEE ALSO
.Xr rsh 1 ,
.Xr iruserok 3
.\".Sh STANDARDS
.Sh HISTORY
The
.Nm
command appeared in
.Bx 4.2 .
.Sh AUTHORS
This implementation of
.Nm
was written as part of the Heimdal Kerberos 5 implementation.
.\".Sh BUGS
